Capstan.



Ilwrrnn @raras PATENT Ormes.

FRANK S. MANTON, OF PROVIDENCE, RIIODE ISLAND.

CAPSTAN.

SPECIFICATION forming part of Letters Patent No. 656,743, dated August 28, 1900.

Application filed April 24, l 8 9 9 T0 L7/Z whom. 7215 may concern:

Be it known that I, FRANK S. MANTON, a citizen of the United States of America, and a resident of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improve` ments in Oapstans, of which the following is a specification.

My present invention relates more particularly to improvements in multiple-power capstans and it consists, essentially, in the novel construction of the driving-head, combined with the barrel, gearing, dac., all as fully hereinafter set forth and claimed.

The primary object I have in view is to produce a strong, efficient, and comparatively inexpensive capstan capable of being operated by horse-power, the construction and arrangement of the parts being such that the liability to accident or derangement of the machine is reduced to a minimum.

In hoisting devices as usually constructedthat is, such as are adapted to be operated by horsepower-the pull or draft bar is not, as a rule, located with respect to the barrel so as to obtain the greatest percentage of useful work. This is due to the fact that in some cases the initial power is transmitted quite a distance through the medium of intervening mechanism before reaching the Windingdrum, while in other cases the drum is simply a revoluble winding-post and is practically integral with the driving beam or bar. By means of my invention, however, the work or power exerted by the horse in actuating the lcapstan may be utilized to a greater extent than in said former devices.

In the accompanying drawings, Figure l is a side elevation representing my improved horsepower capstan. Fig. 2 is a plan view. Fig. 3 is a vertical central section, enlarged, taken on line sc of Fig. 2. Fig. 4 is a plan View of the driving-head. Fig. 5 is a central transverse section taken on line y y of Fig. 4; and Fig. 6 is an inverted end view of the lower portion of the head, showing the clutch formed thereon.

To the stationary base c is secured the vertical central shaft s. On the shaft are loosely mounted the gear-plate f and the center gear g, the latter meshing into the loosely-turning intermediate gears g', mounted on studs g2,

Serial No. 714,179.V (No model.)

gear-plate f is provided with a series of pe' ripheral pockets f', arranged to register with an opening or keyway formed through the side of the base c to receive a removable key k.

I would state here that the several parts briefly described above and forming the lower portion of the capstan have been combined and used in capstans prior'tomy invention, the latter consisting in the novel construction of the driving-head itself, combined with the above-named parts, as before stated.

The driving-head member h (see Figs. 4, 5, and 6) is provided with the flange or disklike portion e and the annular spindle part h2, extending downwardly from the center of said flange and terminating in the end lugs or teeth t, arranged to interlock with corresponding lugs formed in the upper end of the annular extension of the said center gear g, thus constituting a clutch connection. (See Fig. 3.) This spindle is supported by and is adapted to revolve freely around the station ary shaft s. The upper portion of the ange e is provided with the enlarged opening h', arranged at right angles to the axis of the spindle h2y and extends transversely across the flange. It will be seen that the said opening communicates with a chamber s', formed in the upper end ofthe spindle. This chamber is made somewhat larger than the shaft in order to receive a collar or cap c2, fixed to and overhanging the upper end of the shaft, thereby serving to maintain the several parts of the capstan in the proper normal Vworking relation. The driving-head is further provided with oppositely-arranged keyways or pockets d, cutting the periphery of the flange e. These pockets register with corresponding openings formed in the upper end of the barrel member l) and are adapted to receive the block-key 7c, before referred to.' When thus connected or keyed together, the head and barrel will obviously revolve together in IOO long wooden draft-bar B, a pin a, or other suitable device serving to keep the bar in place. At the outer or free end of the bar is mounted a Whiffletree w or other Weil-known draft attachment, through which the power or pulling force exerted by the horse is transmitted to the capstan. With the block-key 7c inserted in the driving head and barrel, as shown in Fig. 1, the parts are then adapted to revolve in unison in either direction at the same rate of speed, thus forming a simple or speed capstan. Upon transferring the blockkey to the base of the capstan, as shown in Fig. 3, the driving head and barrel are then capable of being revolved in either direction, but will turn at different rates of speed, the velocity ratio of the head to the barrel being that due to the difference in diameter of the center gear g to that of the gear-circle in the bottom of the barrel, thereby forming a multiple-power slow-speed capstan.

The capstan may be easily and quickly set up, the draft-bar being readily7 inserted and secured to the driving-head. The barrel is adapted to directly receive the hoisting or Winding rope from any direction or quarter.

The capstan is strong, consists of (few parts, is not liable to get out of order, and is easily manipulated and controlled.

A, Fig. 1, indicates my improved capstan and also shows the draft-bar B inserted in the driving-head.

I make no claim, broadly, to a multiplepower capstan having gears in its base and arranged to receive a shifting block-key 7c, whereby the barrel may be driven at different rates of speed through the medium of a driving-head having the usual capstan-bars, as a capstan embodying these features is shown in United States Patent No. 147,557, issued to Henthorn & Thayer February 17, 1874.

I claim as my invention and desire to secure by United States Letters Patent- In a multiple-power capstan, thecombination of a base, a barrel, having an annular iiange, means to support said barrel upon said base, and a T-shaped head having also an annular flange lapping the aforesaid iiange, and an integral tubular downward extension or spindle, with its inner upper end provided with a depressed annular seat, the transverse portionofsaidheadformingahousingthrough which is passed a sweep or draft-bar, a shaft stepped into said base, and passed through said tubular extension, and a cap or collar secured to said shaft and let into said seat, substantially as set forth.

Signed by me at Providence, Rhode Island, this 20th day of April, A. D. 1899.

FRANK S. MANTON. Witnesses:

GEORGE L. GRAHAM, HARRY O. SWAN. 

